Fig. 2: Laboratory setup and stimulus specification.
From: Afternoon to early evening bright light exposure reduces later melatonin production in adolescents
The individual depicted is author R.L., who has given written consent to the publication of this image. A Laboratory setup with the fluorescent ceiling lamp panel during task-free periods (curtains closed). B Spectral irradiance distribution of the 3 AEE light exposure interventions during task-free periods (curtains closed). The vertical light measurements were taken with a spectroradiometer placed at the eye level of the seated participants (115 cm from the floor, 85 cm from the overhead light source, 80 cm from the white curtain, Spectraval 1501, JETI Technische Instrumente GmbH, Jena, Germany, last calibration: 07.03.2023). C Laboratory setup during task performance using an LCD screen with black background and red lettering (curtains open). D Tabulated stimulus specifications per light intervention during the experiment, derived from vertical spectral irradiance measurements on the participants’ eye level with curtains closed and open, including alpha-opic Equivalent Daylight Illuminances (alpha-opic EDIs) and Correlated Colour Temperature (CCT).
